Heating apparatus for wax-coated paper cups.



Patented Feb. 23, 1915.

2 SHEETS-SHEET 1.

L. W. FARMER.

APPLICATION FILED SEPT. 3, 1912.

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HEATING APPARATUS FOR WAX COATED PAPER CUPS.

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mines-se I r1L/n/LA4 L. W. FARMER. HEATING APPARATUS FOR WAX COATED PAPER CUPS. APPLICATION FILED SEPT. 3, 1912.

1 1%9,$@% Patented Feb. 23, 1915 2 SHEETS-SHEET 2 mag/ 22202;

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' ramp smarts PATENT orripa LUKE wrra' niunn, or SOMERXZILLE, MASSACHUSETTS.

HEATING APPARATUS m wax-comm. PAPER curs. 4

To all whom it may concern:

Be it known that I, LUKE W. FARMER, 'a citizen of the United States, residing at Somerville, in the county of Middlesex and State of Massachusetts, have invented an Improvement in Heating Apparatus for Wax-Coated Paper Cups, of which the, following is a specification. g

In the manufacture-of paper drinkingcups, it is now the common practice to coat the cups with parafiin-wax forthe purpose of making them waterproof. The ordinary means for coating the cups consists in applying paraflin-wax in liquid form, usually in the form of a spray, and subsequently cooling the cups, to cause the liquid coating to solidify, but the coating is notuniformly applied, hence the coated cups have been placed for a short period of time in an oven which is heated to a high temperature, and, as a result, the paraffin becomes uniformly distributed over the entire surfaces ofthe cups.

This invention relatesto improvements in the heating apparatus employed for this purpose, said apparatus having a slowly moving conveyer for the cups, which passes through it, by which the cups enter a heat-- ing chamber at one end and leave said chamber at the other end, said-conveyeralso extending beyond the apparatus for a considerable distance at the egress thereof to allow the cups to cool sufliciently tdenable the paraffin to become congealed beforeth cups are discharged. This apparatus is usually heated by means of one or more gasheaters, and much danger arises from the fact that some paraflin drips from the cups and upon encountering the .gas flame becomes ignited, resulting in a fire in the apparatus, and although usually confined therein, yet is dangerous.

My invention has for its object certain improvements in said apparatus whereby this objection is overcome, and consists essentially in arranging a shield beneath the cup-conveyer and within the chamber, having means to collect the li'quid pa-rafiin and to deliver it to a receptacle or place remotely disposed with respect to the gasheate Figure 1 is a rear elevation of the heatingappara-tus embodying this invention. Fig;

2 is a plan view of the same. Fig. 3 is a transverse section of the same, taken on the dotted line 3- 3, Fig. 1. Fig. 4 is a vertical Specification of. Letters Patent. aii uoauon filed September a, 1912. Serial No. 718,202.

Patented Feb. 23, mils.

longitudinal sectio of I paratus taken on the dotted line 4-4, Fig. 3. The inclosing-case which forms the heating-chamber comprises a top wall 10, endwalls 12, 12, stationarily supported by suitable corner supports, and hinged doors 13, which form the front and rear walls of the case. The'end walls 12 only partially close the ends of the heating-chamber, there being a space provided at the top for'the reticulated conveyer 15 and a space provided at the bottom] for the inlet of air. The conveyer 15, is made endless and passes over several rolls 16, so that its upper portion passes through the case from end to end thereof, and its lower portion passes along the under side of the case. Said conveyer extends beyond thecase at each end topro- .vide forreceiying the cups at one end, and

forholding them for a short periodof time while they cool at the other end. The case a portion ofthe ap- I has a floor 20, and on said floor one or more 1 gas-heaters 21, ofv any usual or suitable construction are placed. A plate 22 isarranged on top of said gas-heaters, which is here shown as imperforate, and made large enough to entirely cover the tops of the heaters but does not extend theentire width of the case, see Fig. 3.

- In the top part of the case a perforated plate 25 is arranged horizontally, directly beneath the upper part of the conveyer, and said plate is supported by projections on -the case. Between the plate 22 and the per'forated plate 25 a shield 30 is arranged, which,

as here shown, is made of sheet metal, in-

verted V-shape in cross section, and extended from end to end and from side to side of the case. Said shield is attached to the frame of the case or is otherwise supported.

Said shield has its lower side edges turned up on the inside of the case as at 31, thereby to form a channel at each side extending from end to end of the shield, and at a point intermediate the length of said channels a perforation 32 is formed. The drippings down into the channels at the sides thereof, and then pass through the perforations 32, whereupon they fiow into receptacles 40 provided to receive them. As the lower ends 50 of the doors areturned in to better close the sidesand confine the heat, said lower ends are bent to form channels and have a single perforation arranged in alinement with the perforations above them, so that the dripfrom the cups fall onto said shield and flow I pings will .pass through both perforations in order toreach the receptacles.

Iclaim:

1. In a heating apparatus for Wax coated cups, an .inclosing case, an endless conveyer operating through the case, a heater arranged below the upper traveling portion of the conveyer and an inverted V-shaped shield overlying, the under traveling portion of the conveyer, and overlying the heater, said shieldhaving a transverse d1- mension greater than the similar dimension of the heater and being formed in its lowermostside edges to provide receiving channels. 2; In a heating apparatus for wax coated cups, an inclosing case, an endless conveyer operating through the case, a heater arranged below the upper traveling portion of the conveyer and an inverted V-shapedf shield overlyingthe under traveling portion of the conveyer, and-overlying the heater, s aid shield having a transverse dimension greater than the similar dimension of the' heater and being formed in its lowermost side edges to provide-receiving channels, re-

ceptacles arranged in the case below the doors being inturned to provide a more perfeet airtight connection with the casing, the

inturned portions being bent to form channels and formed in said channel portions with perforations to deliver melted material therefrom.

. In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.-

' LUKE W. FARMER.

Witnesses:

Gno. R. B'LmN, ,Lnor M. Lmnomsr.

doors closing openings in the casing, said J, 

